Where are viewing those files on iPad and tablet.
The Publish Online(preview) is a browser based feature.
With Publish Online, you can now repurpose your print documents by publishing them online. You can publish a digital version of an InDesign document that works on any device, in any modern web browser, without the need to install a plugin.
Please let me know if this is not the case.
Thanks and Regards,
It is working for me in iPad.
I tried in safari browser. Try to use different browser.
I will trie this evening at home. I think my iPad uses also Safari. Maybe the version number of Safari is also important if it showes alright.